Features: Built-in BT 3.0 module, can be paired with for iPhone 4/4s/5/5c/5s, for iPad, Galaxy S4/S3, Note3/2, for HTC phones or any other BT-enabled devices. Support BT stereo sound, perfect sound quality. Built-in Microphone, enjoying hand-free call. Powered by built-in rechargeable battery (charged by USB cable). With unique water-resistant design with suction cup back, it can be sucked on any flat surface including desk, shower, door, wall, window, etc. Convenient buttons for music and call control. Suitable for car, bedroom, wash room, kitchen, office, conference, business trip, vacation, etc. Note: 1. This item can not be totally put in the water or any liquid. It's just water resistant(IPx4). 2. After use, please keep the suction cup upwards in case that it is sucked tightly by the base of the case.